To understand the impact of ongoing reform of mental health and dementia care in Ontario, an examination of prevalence and health services utilization rates is needed. However, there exists a gap in current prevalence and health services research specific to dementia care in Ontario. The objective of this study was to address these concerns using linked administrative databases to determine the incremental use of health services by elderly Ontarians with dementia. Overall, study results demonstrated that individuals with dementia used services in a pattern similar to non-demented persons, albeit at a higher level. Exceptions were women's use of hospital and home care services, where the most elderly women received significantly fewer services. Thus, the study provided important insight regarding the relative levels of health services used by demented Ontarians. Research in this area will become increasingly important as the population ages and the settings integral to dementia care and management shift and evolve. (Contains 7 tables and 2 notes.)